riffeln 



234 



Rohr, Fol ge- 



diaphragm, d. with circular cor- 

 rugations. 



riffeln furrow, channel, groove, 

 ripple (flax). 



Rille furrow, groove, track (of 

 phonograph disk). 



Ril le,Führungs-, Schal 1- groove or 

 track with undulations (of phono- 

 graph record or disk). 



Rindenschicht cortical layer. 



Ring,geteil ter split ring, segment- 

 ed r. Absaug- (cf. Saugspannung) 

 annular or ring-shaped collector 

 electrode. Aufschraub- lens 

 flange. Befest igungs- ring 

 fastener, fastening r. Debye- 

 Scherrer- D.-3. ring or circle, 

 powder pattern, Hull r. Dichtungs- 

 gasket ring, gland. Lauf- race, 

 raceway, ball-race (in bearing). 

 Peil- direction-finder loop or 

 fraae. Schleif- slip ring, col- 

 lector r. Teil- index ring. 

 Verschluss- locking collar (of 

 magnifier). 



Ring-bildung ring formation, 

 -bol zen eyebolt. -elektroden, 

 abbildende focusing rings. 

 -entladung ring discharge, 

 -figur zone plate (of Presnel), 

 Huygens z. 



ringförmig ring-shaped, annular, cy- 

 clic, toroidal, toric. 



Ring-kopf annular recording head. 

 -leitung, Antennen- multiple-re- 

 ceiver connection to antenna, 

 -lochscheibe film scan disk (with 

 apertures arranged circularly), 

 -Übertrager repeating coil. 



ringungesättigt cyclically unsatu- 

 rated, containing an unsaturated 

 ring. 



Ringwulst tore, torus, toroid, 

 "doughnut". 



Rinne channel, groove, gutter, 

 trough. 



rinnen run, flow, trickle, leak. 



Rippe rib, fin, vane, ripple, flute, 

 corrugation, undulation, section 

 (of a radiator). Kühl- cooling 

 fin, c. flange, radiator fin. 



Rippentrichter ribbed funnel. 



Riss fissure, crack, flaw, rent, 

 tear, gap, opening, elevation 

 (say, front or side). 



Riss, Haar- micro-flaw, hairline 

 crack, craze, capillary hair 

 fissure. Schatten- silhouette. 

 Seiten- lateral elevation, side e. 

 SP alt- cleavage crack, c. fis- 

 sure. 



Riss-bildung cracking, fissuration. 

 -festigkeit crack strength, c. 

 resistance, -härteprobe abrasion 

 test, scratch t. 



RissigkeitjSchweiss- chinking or 

 fissuration due to welding. 



Ritze rift, slit, fissure, crack, 

 chink, cleft, scratch, stimm- 

 glottis, glottic catch or cleft. 



Ritzhärte scratch hardness, 

 sclerometric h. -prüfer 

 sclerometer, scratch hardness 

 tester. 



Ritzspalt scratched slit (for in- 

 stance, in silver coat, in sound 

 recorders). 



Roentgen. . ^.s. Röntgen... 



roh raw, coarse, rough, unrefined, 

 unwrought, unworked, unfinished, 

 in blank form; broad (radio tun- 

 ing). 



Roh-block (raw) ingot, -bramme 

 slab, ingot, -film blank film, 

 raw stock, -formel empirical 

 formula, -gang abnormally fast 

 drive or run, irregular working 

 (metallurgy), -ling blank, un- 

 worked, unfinished or unfashioned 

 piece or part. 



Rohmannshaut Rohnann's skin. 



Rohr (s.a. Röhre) tube, valve (radio); 

 pipe, duct, conduit. -, hartge- 

 schlossenes rigidly. terminated 

 tube. Abzugs- vent stack (of an 

 arc-lamp) Befehl s- pilot or 

 master thyratron (firing first in 

 a trigger circuit). Beobachtungs- 

 observation tube (of electron 

 microscope). Dunst- ventilating 

 pipe. Folge- piloted thyratron 

 (fires second in a trigger circuit). 



